LASER-AIDED EDGE DIAGNOSTICS

The objective of laser-aided edge diagnostics is closely connected wit h plasma wall interaction processes. Thus at first a short description of the plasma regions near first wall, limiter or divertor nad the mo st important quantities and processes to be evaluated there is given. A very important technique to measure electron densities and temperatu res in the edge is Thomson scattering. Collective scattering represent s a useful method to quantify fluctuations of electron density and the ir relation to particle and energy transport. To detect neutral partic les and energy transport. To detect neutral particles and ions after t heir release from the wall and during recycling phases laser induced f luorescence (LIF) is a well established technique. Future applications of laser diagnostics as two-photon scattering and coherent anti-Strok es Raman scattering (CARS) are discussed.